Pope Francis has slammed the unhealthy lifestyles of young people and urged them to ditch their computers and smartphones.

During a huge outdoor mass Francis, 79, challenged 1.6 million young people who gathered in a sprawling meadow on the outskirts of Krakow, to reject being a 'couch potato' and instead 'leave a mark' through by social activism.

The Pontiff, who admitted he was a 'disaster' with technology, sprinkled his sermon with social media and technological terms in order to connect with his youthful audience as he presided at the Catholic Church's World Youth Day festivities.

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Pope Francis has slammed the unhealthy lifestyles of young people during a mass speech in Poland as part of the Catholic Church's World Youth Day festivities

Faithful crowds wait for the arrive of Pope Francis in sprawling fields outside of Krakow in Poland, at the conclusion of the Catholic Church's World Youth Day

Nuns and clergy celebrate the arrival of Pope Francis during the final mass of his five day-long tour, near the city of Krakow in Poland

During his speech the Pope asked young people to 'refuse to see borders as barriers' and to reject hatred between those of other races

He challenged his sea of listeners, spread out on blankets, to make their mark on the world by becoming engaged as 'politicians, thinkers, social activists' and to help build a world economy that is 'inspired by solidarity.'

'The times we live in do not call for young 'couch potatoes',' he said to applause, 'but for young people with shoes, or better, boots laced'.

He also urged the young people to ''download' the best 'link' of all, that of a heart which sees and transmits goodness without growing weary.'

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The Pope continued that their response to the challenges of life cannot be 'texting a few words,' that prayer should be given pride of place over their internet 'chats', and that God's memory was not a 'hard disk' filled with files on everyone, but more of a compassionate heart that wants to help them 'erase' evil.

Francis encouraged them to continue 'to be dreamers (who) believe in a new humanity, one that rejects hatred between peoples, one that refuses to see borders as barriers'.

Like a politician working a crowd, Francis yelled out to his audience: 'You want others to decide your future?' When he didn't get the rousing 'No!' he was going for, he tried for a 'Yes.'

'You want to fight for your future?' he asked.

Around 1.6 million young people of all ages gathered on the sprawling fields outside of Krakow to listen to the Pope speak today

The Pope urged young people to be more interested in social change and encouraged them to be 'dreamers' rather than 'couch potatoes'

Bishops hide under parasols as they attend the Holy Mass celebrated by Pope Francis in fields near Krakow on the final day of his tour

Hundreds of thousands of Catholics gathered to celebrate the Holy Mass. Pictured, confetti falls over the pilgrims during the ceremony

'Yes!' they roared.

'The pope does not order us to do things, he encourages us,' said Szymon Werner, a 32-year-old from Krakow who was at the meadow.

'It's true, there are many temptations, weaknesses in life and we should try to do something about them.'

'I will give more attention to my family,' he vowed. 'Last night, I gave a lift to some foreign pilgrims who missed their bus - so I think the pope's presence is working!'

During his speech the Pope used technological language in order to connect with youthful audience and urged young people to take an active role in society

Pope Francis waves to adoring crowds as he arrives to celebrate a Holy Mass in front of 1.6million people in fields near Krakow

Pictured, Pope Francis talks with the President of Panama Juan Carlos Varela (right) and wife Lorena Castillo de Varela (second from right), as Polish President Andrzej Duda, second from left, and his wife Agata Kornhauser-Duda

Pictured, Catholics of different nationalities wave flags and cheer as the Pope makes his speech on the last day of his Polish visit

The Pope's Polish trip has been marked by heavy security, including metal detectors and sniffer dogs at most events.

During an unscheduled stop in a Krakow church on Saturday night, Francis condemned the 'devastating wave of terrorism' and war that has hit the world.

When he started the trip on Wednesday, Francis said the killing of an elderly priest in France by suspected Islamist militants and a string of other attacks were proof the 'world is at war' but that it was not caused by religion.

It has been an eventful few days for the Pontiff, who included a visit to the Nazi death camp Auschwitz into his itinerary

Wearing white robe and skullcap, Francis walked slowly beneath the notorious gate at Auschwitz bearing the cynical words 'Arbeit Macht Frei', meaning 'work sets you free'. He was then transported on a small car past barracks and brought to a spot in front, where he sat on a bench, his head bent for many long moments in contemplation and prayer.

Pope Francis walks through a gate with the words 'Arbeit macht frei' (Work sets you free) at the former Nazi German concentration and extermination camp Auschwitz-Birkenau in Oswiecim, Poland

Pictures captured the moment Pope Francis fell over during Mass in front of a television audience of millions while visiting Poland's holiest site

The Argentine pontiff led prayers for the 1.1 million mostly-Jewish victims murdered at the camp and rather than making a speech he stood in silence to reflect on the horrors committed and let his tears flow.

He also travelled the two miles (three kilometres) to Birkenau, the main extermination site at Auschwitz, and was driven along tracks laid in 1944 to allow trains of prisoners to be transported right to the gas chambers and crematoria.

Away from visiting areas of cultural and historic significance the Pope also caused a stir when he celebrated Mass at Poland's holiest site.

The 79-year-old Pontiff stumbled at the altar and had to be helped to his feet as he celebrated a Mass at the Jasna Gora Monastery in the southern city of Czestochowa.

Pictures showed him tumbling to the floor next to steps leading to the open air altar and being helped to his feet by Vatican Master of Ceremonies, Guido Marini. He was uninjured and finished the event, which was aired to a television audience of millions.

Francis, walking in his long robe with an incense holder in his hand, did not notice a step down from the platform and fell to the ground before the altar. He braced his fall with his left hand and priests around him rushed to help.